This blogpost is focused on looking at how What’s Past is Prologue, the sixth episode of Star Trek: Discovery fits into the events and themes of the previously established universe. I’ve written similar blogposts looking at each previous episode (you can read the first here, and a full list under the Star Trek Discovery tag).
The Terran Empire’s toxic approach to the mycelial network is essentially a fossil fuel metaphor. Whereas the Prime Universe crew are conscientious about doing as little damage as possible, the Charon’s mycelial power core poisons the wider mycelial network while drawing power from it. Saru to be shocked by the Terran Empire’s short-sightedness, given that the process means that eventually, in Stamets’ words, “life as we know it will cease to exist”.
This recklessness works as a parallel to the real-world use of fossil fuels. Despite its hippyish idealism, the Star Trek franchise hasn’t touched on climate change and environmentalism as often as might be expected. The most notable exception is the TNG episode Force of Nature – built on the premise that warp engines damage areas of space which have excessive warp travel, an issue which isn’t revisited on-screen. (I’ve read that the reason Voyager’s warp nacelles physically rise before the ship goes to warp is to counter this effect, though I’m not sure whether this is canonical.) The climax of What’s Past Is Prologue implies that this analogy won’t be immediately revisited, but it’s a storytelling device that DIS could reuse in future.